Service trials and performance of concrete sleepers, in particular with types D912 and F27A: A supplement to report TM TS 36 (TM-TS-117)

Report TNTS 36, dated November 79, described the service trial installations and initial performances of approximately the first 5600 F27A/D912 sleepers manufactured for BR. The service periods involved were about one year only, and there were 3 sites in the Scottish Region on the Edinburgh-Glasgow main line, and 2 sites...